Grain-screen.



no. 693,447. hunted nu. la; |902. .1. sAcoA. 4A(illN- SCREEN.

(gppumgon med nb. 8,1900. non-Swed Agg. 1s, 1901.)

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UNTTED STATES PATENT (kruid-E,v

JoHN sAooRa'oE DEKALB,` iLLINoIs.

GRAIN-SCREEN.

SPECIFICATION forming part of Letters Patent No. 693,447, dated February 18, 1902. Application filed February 8| 1900. Renewed August 19, 1901. Serial No. 72,581. (No model.)

T allzu/1,0711, it ntcty concern/ f v Be it known that I, JOHN SAooRA, a oil izen of the United States, residing atDeka'lb, ini

the county of Dekalb and State of Illinois, have invented certain new and useful Improvements in 4@bain-Screens; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to grain-screens, and more particularly to that class of screens used in winnowers of grain-threshing machines.

The object of the invention is'lto provide a screen which shall be simple of construction,

durable in use, `comparatively inexpensive of production, and which shall be adjustable lto regulate it to different materials to be v tical sectional view through the plates forming the two screen-sections. v Fig. 5 is a detail View showing the locking device for holding the plates in adjusted position.

In the drawings the same reference characters indicate the same parts of the invention.`

1 denotes the frame of the lower screensection, and 2 the frame of the upper screen.

section. The frame ofthe lower screen-section is composed of the longitudinal bars 3 and the cross-barslland 5. Placed upon these bars and secured thereto is a lower screenplate 6, which has tongues 7 rstruck up therefrom' and-bent downwardly to form open- The outer longitudinal pieces 3, `constituting thelowerscreen-frame, are provided with slots '14, throu ghwhich` proj ectl plates 1'5, the lower angular ends 16 of which are secured to said side pieces, while the upper angular ends are bent over the beveled faces ofthe side .pieces 2 ofthe upper screen-frame and serve as a guide to permit of the adjustment of the upper frame longitudinally with re-` spect tothe lower frame.

17 denotes a crank-shaft jourualed in bearings 18, SecuredA to the under side of the lower frame, and 19 denotes lugs projecting upwardly from the sidey pieces ofthe upper frame `and `connected tothe cranks of said rshaft by a pivot-bolt 20.u p, y

2l denotes an adj uSt-inglever pivoted to one of the side pieces of the lower frame land provided with a lateral stud 22,-working through a segmentally-slotted guide-plate secured tor said side piece of `the lower frame. T0 this stud is pivoted one end of a link 23,'which has its other end pivoted tothe crank-arm.

'To adjust the frame, vthe lever is operated to slide one screen-plate with respect to the other, and thereby increase or decrease the size of the registering openings therein. When the screen-plates havebeen properly adj usted, they are locked in said adjustment by a thumb-screw 24:, working through a vertical slot 25, formed in one of the side pieces of the lower frame. The lower end of the thumb-screw extends through" an angular :plate 26, secured to one end of the lower screen-plate, and is provided with a swiveled washer 27. By tightening this screw the angularplate and the upper screen-section are firmly clamped tothe side bar of the lower Vscreen-frame.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of this invention will be readily apparent without requiring an extended explanation. l-t will be seen that my improved screen is simple of constructiomthat said construction permits of its manufacture at small cost, and

`that it is exceedingly well adapted Vfor the purpose for which it is designed. Various changes inthe form, proportion, and-the minor detailsof construction maybe resorted Vto without departing from the prinmp1@ o1'- saerieing my e'f the advantages of this invention.

\ Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

l. A screen consisting of an upper frame and a lower frame, each of which is provided with a screen-plate having registering apertures, the lower screen-frame being formed with longitudinal slots, plates extending through said slots and having their lower ends passed into the side pieces of the lower screen-frame and their upper ends bent over the side pieces of the upper screen-frame, a slot formed in the end of one of the side pieces of the lower frame, a bolt extending through said slot,through the upper plate,and through an angular plate fastened to the lower screenplate and provided with a washer and nut,

lugs secured to the side pieces of the upper screen-frame, a crank-shaft, links connecting the lugs with the crank-shaft, a pvoted le ver, and a link connecting one of the cranks and said pivoted lever, substantially as set forth.

2. A screen-plate having tongues struck up therefrom to form apertures, said tongues being bent back and resting against the body of the plate and thence bent upwardly, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN SACORA.

Vitnesses:

WALTER WHITE, Il. YV. PRENTICE. 

